Returns the Parallel Axis Theorem matrix to translate the inertia
matrix a distance of (dx, dy, dz) for a body of mass m.

Examples

If the point we want the inertia about is a distance of 2 units of
length and 1 unit along the x-axis we get:
>>> from sympy.physics.matrices import pat_matrix
>>> pat_matrix(2,1,0,0)
Matrix([
[0, 0, 0],
[0, 2, 0],
[0, 0, 2]])